Characteristics of a file that must be specified to save it:
1. File name: The file name is a unique identifier for the file and is used to distinguish it from other files. It is important to give a descriptive and meaningful name to the file to easily recognize its content.
2. File location: The file location refers to the directory or folder where the file will be stored. It determines the specific path or location on the computer's storage system where the file will be saved.
3. File extension: The file extension is a suffix added to the file name, separated by a period, which indicates the file's format or type. It helps the operating system and applications identify and understand how to handle the file. Examples of file extensions include .txt for text files, .docx for Word documents, .jpg for image files, etc.
Why all of these characteristics are necessary:
- The file name helps in identifying and organizing files, especially when dealing with multiple files.
- The file location determines where the file will be saved, making it possible to retrieve and access it later.
- The file extension is essential for various reasons:
- It allows the operating system to associate the file with the appropriate program or application.
- It helps users understand the file's format and how to open or view it.
- It enables compatibility between different software and devices.
In conclusion: All of these characteristics (file name, file location, and file extension) must be specified to successfully save a file. Each characteristic plays a crucial role in managing and accessing files effectively.

Answer is D option